Light of wavelength 600 nm is incident on a pair of slits 2,000
nm apart. Find the angular deviation of (a) the first minimum, (b)
the first, second, and third maxima above the central one. (c) What
is the longest wavelength for which there are four maxima above the
central one? (d) The same light is incident on a diffraction
grating with adjacent slits 2,000 nm apart. Compare and contrast
the resulting interference pattern with that of the two-slit
system.